Dental Materials | Test For NTS PPSC FPSC, TEST

The main purpose of adding metallic oxides in ceramic is________________?

Hamad Dental Ceramics & Miscellaneous 27/10/2021

A. Colour matching
B. Transparency
C. Opacity
D. None of the above

Which of the following impression material is elastic________________?

Hamad Impression Materials 26/10/2021

A. Impression compound
B. Zinc Oxide eugenol (ZOE) paste
C. Wax
D. Polyvinyl siloxane

When making a polysulphide impression for a caste crown, custom trays are usually preferred over stock trays for all of the following reasons except_______________?

Hamad Impression Materials 25/10/2021

A. Custom trays facilitate uniform contraction of impression material
B. Custom trays require less impression material
C. Stock trays may be short in the flange area
D. Impressions made n the custom trays are easier to remove from the mouth

Which of the following statement is true regarding lathe cut low Copper silver alloy ?

Hamad Amalgams 25/10/2021

A. Requires least amount of mercury
B. Achieves high compressive strength at 1 hr.
C. Has tensile strength both at 15 minutes and 7 days is comparable to high copper, unicompositional alloys
D. Has lower cree value

Softening heat treatment of alloy increases_________________?

Hamad Metallurgy 24/10/2021

A. Tensile strength
B. Proportional limit
C. Ductility
D. Hardness

Finishing and polishing of Amalgam make the restoration______________?

Hamad Amalgams 23/10/2021

A. Increase in tarnish and corrosion resistance
B. Increase the marginal strength
C. Decrease the tarnish and corrosion resistance
D. Increased compressive strength

Modulus of elasticity means_______________?

Hamad Physical Properties 23/10/2021

A. Rigidity or stiffness of the material
B. Ability to be stretched with permanent deformation
C. Ductility of a material
D. Malleability of the metal